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Reaction of Some Hybrid Germplasms to Major Three Diseases of Rice

B. K. Mohanta
Department of Plant Pathology, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh.

M. R. Alam
Department of Agronomy, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh.

M. K. Anam
Research Associate
SHIP, PETRA, SPC, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh.

M. A. Habib
Seed Pathology Centre, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh.

M. M. Alam
Department of Agronomy, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh.

Abstract/ Executive Summary:

Experiments were conducted at the field laboratory of the Department of Genetics and Plant Breeding of the Bangladesh Agricultural University, Mymensingh, during T.aman(Rainy- Kharif) and boro (Dry-Rabi) season.Twenty eight breeding lines and four HYVs (standard checks) were used for screening resistance to bacterial leaf blight(BLB) (caused by Xanthomonas oryzae pv. oryzae), sheath rot (caused by Sarocladium oryzae), sheath blight (caused by Rhizoctonia solani), The breakout and severity of percent leaf/sheath area diseased were recorded under natural infection. On the basis of disease intensity, one breeding line was found moderately resistant, 13 were moderately susceptible and 13 were susceptible and 5 were highly susceptible to BLB at t. aman season and at boro season, 5 were highly resistant, 5 were resistant, 12 were moderately resistant and 9 were moderately susceptible to BLB. In case of sheath rot, 6 were moderately resistant, 26 were moderately susceptible and 2 susceptible in T. aman season. One line was resistant, 14 moderately resistant and 17 were moderately susceptible to sheath rot in boro season. At t. aman season, 29 lines were resistant, 3 were moderately susceptible and at boro season, all cultivars including checks were resistant to sheath blight. Considering both seasons, the accession numbers 56, 57, 64, 66, 71 and 73 showed comparatively better performance against above mentioned three major rice diseases.

Keywords: Reaction, Germplasms, Major, Diseases, Rice

Location: Field Laboratory of the Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

1. To gather information on the severity of different diseases

2. To find out the resistant variety/line of rice.

Methodology:

The experiments were conducted at the Field Laboratory of Genetics and Plant Breeding of Bangladesh Agricultural University, Mymensingh, during T.aman and boro season. Twenty eight different genotypes/advanced breeding lines and four HYVs (BR29, BR28, BR14, BINA-6) were selected for this study. Seeds were collected from Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh along with the accession no./variety no. and sources. Seeds of genotype was presoaked separately in tap water for 24 h and then excess water was drained out and the seeds were incubated for 48 h for sprouting. Seedbed was prepared in a medium low land of Field Laboratory of the Genetics and Plant Breeding Department. The soil was puddled with the country plough. The previously sprouted seeds were sown on individual stripes in the seedbed on 1st July 1999. Irrigation was applied to the growing seedbed as and when required until the day before transplanting. Soil of the main land was opened by tractor. The land was ploughed and cross- ploughed several times until the soil was brought to a good tilth. All the weeds and stubble were removed from the field. Soil was kept exposed to natural weathering for 15 days before the land was finally prepared for transplanting. Fertilizer urea, TSP (triple super phosphate), MP (muriate of potash), gypsum and zinc sulphate were applied as per recommendation of BRRI. The following doses of fertilizers were applied to the plots. Urea (N₂) 180 kg ha^-1, TSP (P₂O₅) 100 kg ha^-1, MP (K₂O) 70 kg ha^-1, gypsum (S) 60 kg ha^-1 and zinc sulphate (Zn) 10 kg ha^-1. The experiment was concluded in a RCBD. Thirty-days-seedlings were transplanted. Gap filling was done within 10 days of transplanting. Weeding was done before application of urea fertilizer. The field was irrigated to maintain 5-6 cm depth of water in each plot throughout growing season. No fungicide and bactericide were applied to the growing crops to encourage development of bacterial leaf blight, sheath blight and sheath rot disease under natural condition. Leaf/sheath area diseased (LAD) were recorded at panicle initiation stage, milk stage. Ten infected plants in each plot were selected randomly for recording the percent leaf area diseased and the selected plants were tagged. Leaf area diseased of three diseases viz., bacterial leaf blight, sheath rot and sheath blight in the t. aman season and five diseases viz., blast, brown spot, bacterial leaf blight, sheath rot and sheath blight were recorded in boro season following IRRI recommended grading scale. The severity of the symptoms of different diseases developed on genotypes/plants under natural condition. The data collected on the severities or leaf area diseased of different diseases were subjected to the appropriate statistical analysis to determine the level of significance. The differences of the % leaf area diseased among the rice genotypes/accessions were tested using LSD and DMRT test. The mean values of each genotype/accession were used for interpretation and discussion.

Source of Information: Pakistan Journal of Plant Pathology, 1(2-4): 36-39, 2002

Article Link (Online Journal): DOI: 10.3923/ppj.2002.36.39; URL: http://scialert.net/abstract/?doi=ppj.2002.36.39

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Considering the performance in the Kharif and Rabi seasons, the accession numbers 56, 57, 64, 66, 71 and 73 were found to demonstrate comparatively better performance against three major rice diseases.

Knowledge Management: Journal